Thomas Muloni
Full Sail University
Winter park Florida.
Physics
Wednesday, April 24, 2013
Newton’s Laws of Motion
Newton’s laws of motion are physical concepts or theories
derived by Sir, Isaac Newton with the second law of motion as a restatement of
Galileo’s findings that paved way for Newton’s laws of motion shortly after the
death of Galileo in 1642. The discovery of the three laws of motion overturned
the Aristotelian theories in physics. Newton
derived three laws of motion that followed the first publication, Newtons
Philosophia Naturalis Mathematica also known as pricipia.
1.
Newton’s first law also known as the law of
inertia
2.
Newton’s second law of motion
3.
Newton’s third law of motion
Newton’s first law of motion is derived from Galileo’s ideas,
called the law of inertia. The law of inertia states that a body in motion continues
in it’s state of motion in a straight line unless compelled by another object. The law of inertia also states that a body at
rest remains at in it's state of rest unless acted upon by another force.
Newton’s second law of motion states that Acceleration produced
by an object of a net force is directly proportional to the net force of the
object and is inversely proportional to it’s mass.
Given by:
a = F/ M
Where a is acceleration, F is the net force, and M is the
mass.
An increase in acceleration increases the amount of force
applied. If the acceleration is doubled force is doubled as well, and increase
in mass decreases the acceleration, thus If the mass is doubled, acceleration is
halved
Newton’s third law of motion states that action and reaction
forces are equal and opposite. Illustration: If a man swings a punch weighing 1000 pounds
against the wall, the wall will react with an equal force of 1000 pounds in the
opposite direction. Action and reaction forces depend on friction and no one
force exist with out the other.
Illustration of Newton’s third law of motion:
Newtons third law in action:
Newton’s third law of motion is used to explain how a
helicopter is able to take off the ground using a lifting force.
Just before a helicopter takes off the ground, air is forced
down by the blades some times known as the wings, which causes a reaction force
as the blades or wings force the air up. The upward motion of air causes a
lifting force that takes a helicopter or plane off the ground soon as the lifting
force over takes the weight of the helicopter. When the lifting force is equal
to the weight of the helicopter, it only flies in the midair until the
lifting force is greater than the weight of the helicopter. The continuous
downward push of air maintains the helicopter in motion, also caused by the
forward motion of the helicopter or plane.
Newton's third law a true application in life.
Citation:
Conceptual
Physical Science, Fourth Edition, by Paul G. Hewitt, John A. Suchocki, and
Leslie A. Hewitt. Published by Addison-Wesley. Copyright © 2008 by Pearson
Education, Inc. Page51.
(Hewitt 37)
Hewitt.
Conceptual Physical Science, 4th Edition. Pearson Learning Solutions.
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